Device for dressing grinding wheels



F. LOHUTKO DEVICE FOR DRESSING GRINDING WHEELS July 17 1951 2 Sheets-Sheet 1 Filed Dec. 14, 1948 awn INVENTOR m w H O lm v R O L F ATTORNEYS July T7, 1951 LOHUTKQ 2,560,654

DEVICE FOR DRESSING GRINDING WHEELS Filed Dec. 14, 1948 2 Sheets-Sheet 2 mvsmoa FLORYAN LOHUTKO av swan-41M ATTORNEYS Patented July 17, 1951 DEVICE FOR DRESSING GRINDING WHEELS Floryan Lohutko, Detroit, Mich, assignor to The Thompson Grinder Company, Springfield, Ohio, a corporation of Ohio Application December 14, 1948, Serial No. 65,257

2 Claims. 1 o This application relates to a dressing tool for grinding machines, and particularly to an improved type of dressing tool composed of a plurality of individual elements.

by the drive motor 20 connected with the supporting shaft of the dressing member by belting, gearing, or the like contained within the housing 22.

Grinding wheels are usually dressed by a 5 The dressing member [8 mounts around its pediamond cutting device or by a crush dressing riphery a plurality of individual elements 24 and roller. Each of these devices has certain limitawhich are better illustrated in Figures 3 and 4. tions thereon as, for example, the smooth finish These individual elements comprise end parts as obtained on the wheel by a diamond dressing tool at 26 of sintered material containing silicon carwhich materially decreases the cutting speed of 10 hide and preferably include a predetermined the wheel, and the difficulty of forming a crushamount of diamond dust or diamond grit. ing roller to the exact shape desired and main- As is well known, work members formed of taining it within predetermined limits over a silicon carbide and fusible powdered ma erial, as number of dressing cycles. for example, powdered metals, carbon and resin The primary object of the present invention or like binder, can be shaped in a suitable die is to provide a grinding wheel dresser which can and sintered to a very exact shape. Such treatbe made very accurately and which will retain 11161117 is the basis of y pr d ts, uc as its accuracy for a long period of time. Carboloy and Stellite cutting tools. By so Another object is to provide a device for dresspin the individual elements y can b ing a grinding wheel which W111 provide for a formed to a very exact size and by incorporating highly accurate wheel and one which has a very diamond dust diamond grit e e can be rapid cutting action. made to have a very fast cutting action on a These and other objects and advantages will grinding wheel. become more apparent upon reference to the fol- The smteled end Darts 23 a e ca d on the lowing description taken in connection with the tapered sh k 8. d the t p ed s ank is acco npanying drawings in hi h; adapted for bein received in a tapered bore Figure 1 is a perspective view of a portion of a in peripheral flange P 32 F the dressing typical grinding machine showin the grinding member p Screws 34 p the me s heel and a dresser according to invention for retaining the individual dressing elements in associated therewith; 30 their respective tapered bores.

Figure 2 is a fragmentary section of the wheel and as indicated by the line 2-2 on Figure 1;

Figure 3 is an enlarged side View of a dressing tool constructed according to this invention;

Figure 4 is a vertical section taken through a modified form of the dressing device;

Figure 5 is a perspective view of a portion of the device shown in Figure 4 illustrating the arrangement oi the individual dressing members therein; and

Figure 6 is a fragmentary view showing a modified form of individual dressing member.

Referring to the drawings, the grinding machine shown therein comprises a reciprocable Work holding table It, and associated therewith is a grinding wheel l2 mounted on the shaft of a drive motor it. The wheel may be adjustable in the usual manner relative to the table in order to properly present it to a workpiece mounted thereon.

Also mounted on the table it) and at one end thereof is a frame it which rotatably supports a drum like dressing member [8. This dressing member is adapted for being driven in rotation as The dressing member in Figure 1 is shown as having a single row of individual dressing elements therearound and thus can be employed for dressing a wheel to the shape shown in Figure 2 wherein a single groove 36 is formed around the periphery of the wheel. However, a plurality of rows of individual elements may be mounted in the dressing member as shown in Figure 4, and the device can thus be utilized for forming a plurality of annular grooves around the wheel.

It will be understood that the grooves referred to above could be annular or could be spiral around the wheel in the manner of a thread. The particular form of groove is determined by relative movements between the wheel and dressing member during the dressing cycle.

In utilizing the dressing device both the wheel and the dressing device are driven, but at different peripheral speeds. The wheel is then moved into engagement with the dressing device and its periphery is formed. thereby as the dressing member rotates and carries the individual elements into cutting engagement with the wheel.

It will be noted that the individual elements not only cut the wheel due to the diamond grit par- 3 ticles in the said elements, but also provide a picking action, by means of which the bonding of the wheel is crushed, thereby preventing the wheel periphery from being too smooth and slow cutting.

Due to the aforementioned picking action, which would cause a certain radial impact on the individual dressing elements, it may be desirable to provide each thereof with a shoulder as indicated at 38 in Figure 6, and which shoulder will provide for positive radial positioning of the individual dressing elements.

A dressing tool constructed of individual dressing elements according to this invention provides for a very rapid dressing action and results in a sharp wheel which is highly accurate in configuration and therefore produces accurately shaped workpieces.

It will be understood that this invention is susceptible to modification in order to adaptit circumference of said flange, tool members having abrasive heads of a sintered material containing silicon carbide extending radially from said flange and tapered body portions supporting said abrasive heads, said body portions being seated in one end of said bores, fastening meansextending into said bore from the opposite end of said bores 4 and detachably holding said tool members in said bores.

2. In a dressing tool for grinding wheels, a rotatable wheel having an axially projecting annular peripheral flange, a plurality of rows of radial inwardly tapered and co -planar bores equally spaced around the circumference of said flange, tool members having abrasive heads of a sintered material containing silicon carbide and diamond grit extending radially from said flange and tapered body portions supporting said abrasive heads, said body portions being seated in one end of said bores, and fastening means extending into said bore from the opposite end of said bores and detachably holding said tool members in said bores.

FLORYAN LOHUTKO.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 469,091 Prince Feb. 16, 1892 604,569 Ringstrom May 24, 1898 943,989 Nacke Dec. 21, 1909 2,156,066 Royer Apr. 25, 1939 2,195,050 Wallace Mar. 26, 1940 2,380,451 Koebel July 31, 1945 2,435,916 Windsor Feb. 10, 1948 FOREIGN PATENTS Number Country Date 499,767 Great Britain July 27, 1939 518,101 Germany Feb. 11, 1931 

